0217-contains-duplicate.py

# set() 函数创建一个无序不重复元素集
class Solution:
    def containsDuplicate(self, nums: List[int]) -> bool:
        return not len(set(nums)) == len(nums)


# 排序后相邻比较
class Solution:
    def containsDuplicate(self, nums: List[int]) -> bool:
        nums.sort()
        for i in range(len(nums) - 1):
            if nums[i] == nums[i + 1]:
                return True
        return False